improving push constants support, fixing image resolving, lots of rasterizer fixes

src/software/device/Renderer.zig

@@ -166,12 +166,12 @@ pub fn init(device: *SoftDevice, state: *PipelineState, active_occlusion_queries
 }
 
 pub fn draw(self: *Self, vertex_count: usize, instance_count: usize, first_vertex: usize, first_instance: usize) VkError!void {
-    var bounded_allocator: BoundedAllocator = .init(self.device.device_allocator.allocator(), @"1GiB");
+    var bounded_allocator: BoundedAllocator = .init(self.device.device_allocator.allocator(), 4 * @"1GiB");
     try self.drawCall(&bounded_allocator, vertex_count, instance_count, first_vertex, first_instance, null, null);
 }
 
 pub fn drawIndexed(self: *Self, index_count: usize, instance_count: usize, first_index: usize, first_instance: usize, vertex_offset: i32) VkError!void {
-    var bounded_allocator: BoundedAllocator = .init(self.device.device_allocator.allocator(), @"1GiB");
+    var bounded_allocator: BoundedAllocator = .init(self.device.device_allocator.allocator(), 4 * @"1GiB");
     const allocator = bounded_allocator.allocator();
 
     const indexed_draw = try self.readIndexBuffer(allocator, index_count, first_index, vertex_offset);